JP2013244263A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a sense of incongruity received by buttocks when sitting on a cushion body.SOLUTION: A seat includes a seat cushion wherein a seat part of an occupant is formed of a cushion pad 21. The cushion pad 21 has: a filling layer 23; and high-hardness layers 21S, 21B which are harder than the filling layer 23 and are disposed in a surface layer. The high-hardness layers 21S, 21B are disposed such that the high-hardness layers 21S, 21B extend in the back-and-forth direction on both right and left sides of a portion 20H receiving at least the hipbone of the seated occupant. The high-hardness layers include a portion 21B connecting the high-hardness layers 21S, 21B on both of the right and left sides in the seat width direction. The high-hardness layer 21B performing the connection in the width direction is disposed on the back side of the portion 20H receiving the buttocks of the seated occupant.

Description

  The present invention relates to a vehicle seat including a seat cushion in which a seating position of an occupant is formed of a cushion body.

  2. Description of the Related Art Conventionally, a sheet including a cushion body having a two-layer structure of a high density surface layer and a low density packed layer is known. For example, the cushion body disclosed in Patent Document 1 below has a single-layer structure with a low-density filling layer that eliminates a high-density surface layer only for a specific portion corresponding to the seat bone portion of the seated person.

JP 2011-224248 A

  However, since the specific part from which the high-density part is pulled out is set to be oval in the above-described cushion body, the buttock may feel uncomfortable when seated.

  The present invention has been made in view of such problems, and a problem to be solved by the present invention is to reduce the uncomfortable feeling experienced by the buttocks when seated on the cushion body.

  According to one aspect of the present invention, a vehicle seat includes a seat cushion in which a seating position of an occupant is formed of a cushion body, and the cushion body is disposed on a surface layer that is harder than the filling layer and the filling layer. And a high hardness layer. Further, the high hardness layer is arranged so as to extend in the front-rear direction at least on both the left and right sides of the portion that receives the seat bone of the seated person. Therefore, the discomfort that the seated person receives on the seat bone is reduced by arranging the high hardness layer so as to avoid the part that receives the seat bone.

It is a perspective view of the sheet concerning a 1st embodiment. It is a top view of the cushion pad concerning a 1st embodiment. It is sectional drawing in the III-III line of the cushion pad shown by FIG. FIG. 4 is an enlarged view of a portion IV of the cushion pad shown in FIG. 3. It is a top view of the cushion pad concerning a 2nd embodiment. It is sectional drawing in the VI-VI line of the cushion pad shown by FIG. It is an enlarged view of the VII part of the cushion pad shown by FIG. It is a top view of the cushion pad concerning a 3rd embodiment.

  A first embodiment for carrying out the present invention will be described with reference to the drawings. A seat 10 according to the first embodiment is a seat provided in a vehicle. As shown in FIG. 1, a seat cushion 11 on which an occupant sits, a seat back 13 that serves as a backrest for a seated person, and a seated person And a headrest 15 for supporting the head of the head. The seat back 13 is connected to the rear end portion of the seat cushion 11. The seat cushion 11 includes a frame that forms a skeleton, a cushion pad 20 that is attached to the frame, and a cover 30 that covers the cushion pad 20.

  The cushion pad 20 is a cushion body having an appropriate cushion property formed in a pad shape having a predetermined thickness, and supports the seated person while receiving a load from the seated person and bending. As shown in FIG. 2, the cushion pad 20 includes a top plate portion 20M that occupies a central portion in the seat width direction and side support portions 20S that occupy both left and right portions. As shown in FIG. 3, the top plate portion 20 </ b> M is a portion having a substantially horizontal surface in the seat width direction as a seating surface that receives the seated person's buttocks and thighs. The side support portion 20S is a portion having a bank-like raised surface above the seating surface of the top plate portion 20M, and holds the seated person's posture with respect to the seat width direction during turning.

  As shown in FIGS. 2 and 3, the cushion pad 20 has high hardness layers 21S and 21B disposed on the surface layer, and a portion other than the high hardness layers 21S and 21B is a filling layer 23. Yes. That is, the cushion pad 20 has a two-layer structure including the lower filling layer 23 and the upper high hardness layers 21S and 21B in the portion where the high hardness layers 21S and 21B are provided. The filling layer 23 and the high hardness layers 21S and 21B are both made of polyurethane foam, and the cushion pad 20 is formed by molding. The high hardness layers 21S and 21B are formed to have higher hardness and higher density than the filling layer 23 by known means such as changing the composition and production method of the polyurethane foam and the specific molding method of the cushion pad 20. Has been. The high hardness layers 21S and 21B are disposed in the left and right sides and the rear region of the cushion pad 20 so as to avoid the portion 20H that receives the seated bone (particularly the sciatic nodule portion) of the seated person. The left and right high hardness layers 21S are preferably arranged with an interval of 200 mm or more.

  As shown in FIG. 4, the bank-shaped side support portion 20 </ b> S has a recessed surface shape around the boundary between the top plate portion 20 </ b> M and the side support portion 20 </ b> S. In order for the cover placed on the cushion pad 20 to conform to the surface shape so as not to float from the cushion pad 20, the cushion pad 20 has a groove 25S suspended in the surface along the boundary between the top plate portion 20M and the side support portion 20S. Is formed. A holding tool is fixedly provided in the hanging groove 25S, and the holding tool pulls the covered cover into the hanging groove 25S. Thereby, as shown in FIG. 1, the cover 30 is held in a state along the surface of the cushion pad 20. The top plate portion 20M is also formed with a hanging groove 25S in the sheet width direction, and the hanging groove 25S is formed in an H shape as a whole.

As described above, the seat 10 includes the seat cushion 11 in which the seating position of the occupant is formed by the cushion pad 20, and the cushion pad 20 is harder than the filling layer 23 and the filling layer 23. It has high hardness layers 21S and 21B disposed on the surface layer. By hardening the surface layer, the load due to the seating is distributed over the surface layer, and the cushion pad 20 is restrained from being locally bent in the load application range. That is, the entire surface layer, which is the high hardness layers 21S and 21B, acts like a leaf spring, so that the sag and thighs can be prevented from sinking even when the occupant is completely seated. Therefore, the buttocks and thighs are firmly supported, and the feeling of bottoming when sitting is reduced.
This is advantageous when, for example, it is necessary to make the cushion pad 20 thin and the feeling of bottoming can be increased. By appropriately changing the form of the high hardness layers 21S and 21B, the cushion pad 20 having a conventional thickness can be obtained. It becomes possible to maintain the ride comfort. The cushion pad 20 is particularly suitable for a so-called full-form seat cushion 11 in which a metal spring is not provided under the cushion pad 20.
Further, the high hardness layers 21S and 21B are arranged so as to extend in the front-rear direction on both the left and right sides of the portion 20H that receives at least the seated bone of the seated person. That is, the high hardness layers 21S and 21B are arranged so as to avoid the site 20H that receives the ischium, and the seated bone of the seated person is supported by the relatively soft filling layer 23 that occupies the site 20H. Therefore, the uncomfortable feeling that the seated person receives on the seat bone is reduced while the above-described effects are exhibited.
Further, the left and right high hardness layers 21 </ b> S extend to the front end portion of the cushion pad 20. Therefore, sinking of the thigh of the seated person is suppressed, and the feeling of bottoming when seated is further reduced.

Further, the high hardness layer includes a portion 21B that bridges the left and right high hardness layers 21S in the sheet width direction. In this way, the high hardness layer 21B extending in the width direction bridges the left and right high hardness layers 21S, so that the entire high hardness layers 21S and 21B cooperate to act like the above-described leaf spring. Therefore, the sinking of the buttocks and thighs is further regulated.
Further, the high hardness layer 21B bridging in the width direction is arranged on the rear side of the portion 20H that receives the seat bone of the seated person. Accordingly, the high hardness layers 21S and 21B are arranged so as to avoid the portion 20H that receives the seat bone while exhibiting the above effect, thereby reducing the uncomfortable feeling that the seated person receives on the seat bone.

  The left and right high-hardness layers 21 </ b> S extend to the front end, side end, and rear end of the cushion pad 20, and the rear high-hardness layer 21 </ b> B extends to the rear end of the cushion pad 20. . That is, since the high hardness layers 21S and 21B extend to the end of the cushion pad 20, when the cover 30 is covered (covered) on the cushion pad 20, the shoulder shape of the end of the cushion pad 20 is not easily crushed. Covering work becomes easy. Further, since the high hardness layers 21S and 21B extend to the rear end portion of the cushion pad 20, the work of assembling the seat back 13 is similarly easy. Thus, workability in the assembly process of the entire sheet 10 is improved.

  Further, the cushion pad 20 has a hanging groove 25S, and the high hardness layers 21S on the left and right sides are provided along the hanging groove 25S. Since the high-hardness layer 21S is also provided at the site along the hanging groove 25S, the shoulder shape along the groove is prevented from being crushed and gently, despite the tension of the cover 30. Therefore, as shown in FIG. 1, the suspended portion 31 of the cover 30 can be clearly sharpened, and the finish of the cover ring is improved.

  Further, the high hardness layers 21 </ b> S and 21 </ b> B have a higher density than the filling layer 23. Even if the density is higher than that of the filling layer 23, the high-hardness layers 21S and 21B are disposed only on a part of the surface layer. Therefore, for example, the cushion pad 20 is more cushion pad than when the high-hardness layers 21S and 21B are used. 20 can be reduced in weight. Further, since the hardness and density of the filling layer 23 and the high hardness layers 21S and 21B are different, the cushion pad 20 can absorb vibrations in different frequency ranges, and has excellent vibration characteristics.

  Next, another embodiment for carrying out the present invention will be described. 5 to 7 show the second embodiment, and FIG. 8 shows the third embodiment. Of these embodiments, the same reference numerals as those in the first embodiment are used for portions that do not require substantial changes from the first embodiment, and detailed descriptions thereof are omitted. Unlike the first embodiment, the second and third embodiments are not provided with a high hardness layer on the side support portion 20S. Also, the third embodiment is different from the first and second embodiments in that no high hardness layer is provided in the region on the rear side of the portion 20H that receives the seat bone as shown in FIG.

However, in the second and third embodiments, as shown in FIGS. 5 and 8, high hardness layers 121S and 221S are provided in the left and right regions of the portion 20H that receives the seat bone within the range of the top plate portion 20M. It has been. That is, as in the first embodiment, the high hardness layer is disposed so as to extend in the front-rear direction on both the left and right sides of the portion 20H that receives at least the seated bone of the seated person. Further, similarly to the first embodiment, the left and right high hardness layers 121S and 221S are arranged so as to extend in the front-rear direction along the hanging grooves 25S.
Further, as in the first embodiment, the second embodiment includes a high hardness layer 121B that bridges the left and right high hardness layers 121S in the sheet width direction as shown in FIGS. The high-hardness layer 121B in the width direction is disposed on the rear side of the portion 20H that receives the seat bone of the seated person.

  The vehicle seat according to the present invention is not limited to the first to third embodiments described above, and can be implemented in various other forms. For example, the high hardness layer may be partially different in form such as thickness and width. For example, the thickness of the high hardness layer can be gradually reduced toward the end.

DESCRIPTION OF SYMBOLS 10 Seat 11 Seat cushion 13 Seat back 15 Headrest 20 Cushion pad 20M Top plate part 20S Side support part 20H The part 21S and 21B which receives a seat bone High hardness layer 23 Filling layer 25S Suspension groove 30 Cover 31 Suspension part

Claims (3)

  A vehicle seat including a seat cushion in which a seating position of an occupant is formed of a cushion body, the cushion body having a filling layer and a high hardness layer disposed on a surface layer that is harder than the filling layer. The high-hardness layer is a vehicle seat arranged so as to extend in the front-rear direction at least on both the left and right sides of the portion receiving the seat bone of the seated person.   2. The vehicle seat according to claim 1, further comprising a high hardness layer that bridges the left and right high hardness layers in a seat width direction. 3. The vehicle seat according to claim 2, wherein the high hardness layer bridging in the width direction is disposed on a rear side of a seat bone position of a seated occupant.

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